Wayne Hall, a professor and director of the Center for Youth Substance Abuse Research at the University of Queensland in Australia, examined scientific evidence on marijuana's health effects between 1993 and 2013.The risk of using marijuana
- It's likely that middle-age people who smoke marijuana regularly are at an increased risk of experiencing a heart attack, according to the report.
- Regular cannabis users also double their risk of experiencing psychotic symptoms and disorders such as disordered thinking, hallucinations and delusions.
- In a study of more than 50,000 young men in Sweden, those who had used marijuana 10 or more times by age 18 were about two times more likely to be diagnosed with schizophrenia within the next 15 years than those who had not used the drug.
More THC? The effects of euphoria that cannabis users seek from the drug come primarily from its psychoactive ingredient, called delta-9-tetrahydrocannabinol, better known as THC, Hall wrote in the review. During the past 30 years, the THC content of marijuana in the United States has jumped from less than 2 percent in 1980 to 8.5 percent in 2006. The THC content of the drug has also likely increased in other developed countries, Hall wrote in the report. It is not clear, however, whether increased THC content may have an effect on users' health, the report said. Some argue that there would be no increase in harm, if users adjusted their doses of the drug and used less of the more potent cannabis products to get the same psychological effects they seek, Hall said. However, "the limited evidence suggests that users do not completely adjust dose for potency, and so probably get larger doses of THC than used to be the case," Hall said. Blaszaczak-Boxe, A. (2014, 10 6). Marijuana and your health: What 20 years of reasearch revaeals
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